Inductance coil and condenser assembly



Nov. 26, 1940.

L. HARTL 2,222,770

INDUCTANCE COIL AND CONDENSER ASSEMBLY Filed July 13, 1938 (MAGNET/C4759014,

llllllllllllllllllllll K INVENTOR Ll/DW/G HARTL AT TORNEYS Patented Nov.26, 1940 UNITED STATES PATENT OFFICE INDUCTANCE COIL AND CONDENSER. ASSEll/[BLY Telegraphic m. b. H.,

poration of Germany Berlin, Germany, a cor- Application July 13, 1938,Serial No. 218,945 In Germany July 13, 1937 2 Claims.

It is known in the prior to combine iron-cored coils in receiverapparatus with trimming or alining condensers of the rotary type, thelatter being directly attached to the former.

According to this invention, the iron-cored coil and the trimmingcondenser are mounted in a coaxial way, more particularly on oppositesides of an apertured or perforated insulation plate or slab in such away that they may be adjusted 10 from one and the same side or end.

Particular advantages of the invention consist of favorable utilizationof space resulting in reduced dimensions for the entire assembly andreduction of the length of connections to a mini- 15 mum with incidentalsaving of soldering; moreover, the setting of the coil and of thecondenser is accomplishable from one and the same end.

An exemplified embodiment of the invention is shown in Fig. 1. Above theplate or slab P made 20 of a suitable ceramic material is disposed thecasing or can G for the coil L, the can consisting of iron. Introducedin the top hole of the casing is the iron-core E, the latter at itsopposite end being provided with a slot S adapted to intro 25 ducetherein the working edge of a screw driver. Below the said plate P ismounted the trimming or aligning condenser in such a way that itsrotating spindle coincides with the axis of the iron core E. Thisalining condenser comprises 30 the coat B1 placed directly or, ifdesired, recessed or countersunk, on the insulator plate P, and therevoluble ceramic plate or disk A bearing upon its under face the secondcoat B2 recessed therein. A suitable bearing means Q is provided for the5 plate or disk A and is preferably mounted on the under side of theplate P. The two coats consist of semi-circles, and plate A has twostops which are so disposed that in one end or terminal position thecoats come to be superposed in regis- 40 try relationship, while in theother end position displaced an angle of 180 degrees, coat B2 ispositioned above the portion of plate P having no coat.

The revoluble disk has a polygonal co-axial pin 45 or journal Z whichserves to rotate the disk A by the aid of a wrench. The said journal Z,the disk A as well as the plate P are provided with a bore hole throughwhich a screw driver may be passed whose working edge is introduced inthe slot S so that the iron-core may be caused to shift axially by screwmotion.

One suitable adjusting device for the described arrangement is shown inFig. 2. The same consists of a cylinder I being built in the form of 55a wrench R at one end of a size so as to fit the polygonal journal orstud Z. At its opposite end the cylinder is provided with a milled orknurled rim H which serves for convenient turning of the cylinder andthus of the mobile (rotor) condenser member. Through the bore hole ofthe cylinder is passed a screw driver 0 which serves to shift the ironcore E. At its end opposite the edge of same is fitted with a head pieceK and adjoining the latter is a graduated scale M.

Setting is eiiected in such a way that simultaneously the screw driver Cis passed through the hole of the rotary condenser and the plate so asto allow of the introduction of the edge into the slit S, while thewrench R is fitted on top of the stud Z. As a result the two settingsmay be 16 effected by one and the same operation. The size of the axialshift of the iron-core may be read on the scale M.

The bent-away ends or flanges U of the casing or can G may be fastenedon top of the plate P, 20 say, by means of screws. The plate P moreoveris suitably fitted with contacts or terminals by way of which connectionis established with other parts of the set. The connections between thecoil and the trimming condenser, however, could also be insured directlythrough the plate or disk P.

I claim:

1. In an inductance coil and condenser assembly for signalling apparatusand the like, a disk of insulation material, an opening provided on saiddisk along the axis thereof, an inductance coil positioned on one sideof the disk co-axially therewith, a core for said coil mounted so thatits axis is in substantial alignment with the axis of the coil, saidcore being arranged so as to be adjustable along the axis of the coil toprovide for varying the inductance value of the coil, a second disk ofinsulation material having an opening along its axis, said second diskbeing mounted for rotation about its axis and so that the axis of thefirst disk and the axis of the second disk coincide, a condenser havinga stator electrode mounted on said first disk and a rotor electrodemounted on said rotatable disk whereby the capacity value of thecondenser may be varied by rotating the second disk about its axis withrespect to the first disk, the openings in the first and second disksbeing of sufficient size to permit a core adjusting device to beinserted there through.

2. In an inductance coil and condenser assembly a disk having a centralopening, an inductance coil provided with an adjustable core said coilbeing mounted on one side of said disk and ardenser being provided withan opening registering with the opening in the disk whereby the core maybe adjusted from the last named side of said disk.

LUDWIG HARTL.

